The Colts announced the moves on Saturday. Indianapolis also waived-injured guard Kyle Kalis and waived running back Matt Jones. If Kalis clears waivers, he will land on the Colts' injured reserve list.
Brent, 24, entered the NFL in 2016 as an undrafted free agent signing by the Oakland Raiders. He spent his entire rookie season on the Raiders' practice squad and participated in the Raiders' 2017 offseason and training camp before getting waived during final roster cuts. He also spent time with the Seattle Seahawks' practice squad. The 6 foot 3, 202 pound pass catcher signed with the Colts' practice squad on Oct. 24.
Brent had 735 yards and two scores on 56 receptions at South Carolina and Wake Forest. He had 42 catches for 583 yards and a score in 12 games in 2015 for the Demon Deacons.
Fabiano, 24, entered the NFL in May of 2016 as an undrafted college free agent signing by the Baltimore Ravens. He also spent time with the practice squads of the New England Patriots, New York Giants and Washington Redskins this season before signing with the Colts' practice squad on Nov. 28.
Fabiano also spent some of his rookie campaign with the Cleveland Browns' practice squad and active roster. The 6 foot 4, 303 pound offensive lineman has one NFL start and was active for four games for the Browns.